Adhesive
Air conditioning
Bent shaped retained
Breakjoint
Distinct layers
With base
Cellular
Combined
With end structure
With external support structure
Suspended
With hose protector
With indicating means
With means to support disparate element therein
With trench
Corrosion
Bonded to each other
Brazed, soldered or welded
Metal
Spirally wound layer
Coated
Diverse coating material
Reinforced
Spaced
With intermediate insulation layer
With longitudinal seam
Material of one layer passing through seam
With mechanical means to hold layers in contact
With spiral seam
End protectors
Threaded
Flexible
Braided, interlaced, knitted or woven
Plastic
Rubber
With metal
Casing
Corrugated
Spirally
Metal liner
With intermediate metal element
Joined sections
Longitudinally seamed
Spirally wound material
Embedded
Metal core
With interlocked or clamped edge
Packed or sealed
Oppositely wound
With means for facilitating collapse
Glass fiber
Diversity of seam
Permanent type seam
Sectional
Bent over lip or flange
Tongue and slot
With separate mechanical securing means
Bolt, nail, rivet or screw
Radially extending
Externally encircling
With diverse locking means
With interlocking hooks
With packing
With tongue in slot
With wedge
Metal foil
Miscellaneous
Plural duct
Coaxial
Longitudinally extending common wall
Complementary sections
Distinct
Surrounding radially spaced duct with axially spaced supports for internal duct
With spacer and encircling element
Pre-stress
With embedded element
Clay, concrete or masonry
Reinforcement under tension
Repairing
Patches
External
Resins
Shape
Spirally seamed
Structure
Teflon™, kel-f
Thawing and freeze protection
Anti-freeze substance
Electric
Portable thawing apparatus
With closures and plugs
Double end
Inflatable
Inflation stem type
Air and dust cap
Air cap
Dust cap
Lateral opening
Laterally insertable
Line blinds
Pivoted
Return bend type
Test plugs
With flow regulators and/or baffles
Flow facilitating
Heat transfer
Restrictors
Central path
Variable restriction
Tortuous path
With screen
With pressure compensators
Freeze protecting
Expansible or compressible tube element
Variable capacity chambers
Piston or plunger type
With wear indicator
